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March 2001
Vol. 31, No. 3, p 19.
Enabling Science

Table of Contents

Aspi K. Kolah
Qi Zhiwen
Sanjay M. Mahajani

Dimerized isobutene: An alternative to MTBE

Table 2
Published kinetic studies on the oligomerization of isobutene
Catalyst
Conversion and selectivity
Temperature, °C Solvent Remarks Ref.
Amberlyst-15 Selectivity: see Fig. 5 0–80 None or hexane– pentane Reaction scheme and kinetic modeling 6
Amberlyst-15 Conversion: 60–68% 125 H2O–TBAa Co-joint production of TBA and dimer 8
Selectivity: >90%
Amberlyst-15 Yield: 99%
Isooctane–TBA Uses TBA as a starting material. With out dilution, yield is only 30% 9
Amberlyst-15, Amberlyst-35
75 MeOH–MTBE (MeOH/isobutene= 0.2–0.6) Co-joint production of MTBE and dimer. Dimer selectivity depends on MeOH/isobutene ratio 10
Lewatit K2631
40–80 MeOH–MTBE Kinetic model 19
Other catalysts
SPA Selectivity: 66.2% 160–210 Heavy paraffins (octane): 25% Using solvent increases selectivity from 56 to 66.2% 11, 12 13
Aluminosilicate
(Si/Al = 60–90)
Conversion: 88%
Selectivity: 85%
150


aTBA = tert-butyl alcohol

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